Images is one of the best way to make your presentation stock into your audience mind. This is because brain works through images like thinking of a dog and your mind projects an image and not the letters of the word.
If you are not a photographer or graphics designer, chances are you are going to find images online and some of those image have restrictions.
To solve this issue, stock photos came in that let you use it for free. If you are in the transportation niche market, inside this stock image package is a bundle of transportation related graphics which you can to your own project.